FOR HIGH THERMAL AND CHEMICAL LOAD; FOR PASSENGER CAR AIR-CONDITIONING SYSTEMS; HNBR RUBBER O-RING SEAL; INCLUDING: 20PCS 3MM I.D. DIAMETER 1MM; 20PCS 4MM I.D. DIAMETER 1MM; 20PCS 4.5MM I.D. DIAMETER 2MM; 20PCS 5MM I.D. DIAMETER 2MM; 20PCS 6MM I.D. DIAMET